Pen



FIG. 1 is a perspective view of a pen showing the new design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a left side view thereof;

FIG. 5 is a right side view thereof;

FIG. 6 is a top plan view thereof;

FIG. 7 is a bottom plan view thereof; and,

FIG. 8 is an exploded, front view thereof.

The broken lines in the drawings are included for the purpose of showing features hat form no part of the claimed design. 

CLAIM I claim the ornamental design for a pen, as shown and described. 